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Database Error

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You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AND state='' ) AND (is_active_flag = 'YES') ORDER BY views ASC LIMIT 1' at line 1

SELECT ad_id,image_id FROM `guide_ads` WHERE ( category_id= AND state='' ) AND (is_active_flag = 'YES') ORDER BY views ASC LIMIT 1